Although Ubuntu 11.04 comes with tons of new features, it simply fails to impress as much as Linux Mint 11 does. Mint is fast, easy to use and just fresh. Ubuntu Natty though, has a lot to work upon. Earlier, Mint was always a step behind Ubuntu, but by sticking with GNOME classic, it has proven itself as a superior distribution. Only time will tell whether it can retain the top spot as Ubuntu is readying itself for bigger challenges.
It cracks me up that Linux Mint is getting so much good press by rolling the Ubuntu users want rather than the Ubuntu users might want in a few years.